Buttonhole-sewing machine



Aug. 25, 1925. 1,551,141

7 J, FOSSA BUTTONHOLE SEW-I NG MACHINE Original Filed y 27, 1920 2 Sheets-Sheet 1 10115716 5 I I M $414.

Aug. 25, 1925. 1,551,141

J. FOSSA BUTTQNHOLE SEWING MACHINE Original Filed May 27, 1920 2 Sheets-Sheet 2 [Zia/6225902? Zufinesa' W Giitlldfit Patented Aug. 25, 1925.

UNITED STATES PATENT OFFICE.

JOSEPH FOSSA, 0F DANVERS, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHIN- ERY CORPORATION, OF PATERSON', NEW JERSEY, A CORPORATION OF NEW JERSEY.

BUTTONHOLE-SEWING MACHINE.

Original application filed May 27, 1920, Serial No. 384,624. Divided and this application filed December 29, 1920. Serial No. 433,779.

To aZZ whom it may concern:

Be it known that I, J OSEPH FossA, a citizen of the United States, residing at Danvers, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Buttonhole- Sewing Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to stop mechanisms for sewing machines or other high speed machines.

The present application is a division of application No. 384,624, filed May 27, 1920.

The object of the invention is to provide a simple and efficient mechanism which is well adapted for bringing a driven shaft to rest at a definite point in its rotation without shock or jar and without undue strain on the parts, and to this end comprises the features of construction and combinations of parts hereinafter described and set forth in the claims.

A preferred form of the invention is shown in the accompanying drawings, in which. Fig. 1 is a sectional side elevation, Fig. 2 is a sectional end elevation, and Fig. 3 is a detail of the crank shifting mechanism.

In the drawings the invention is shown embodied in a mechanism for driving and stopping the sewing shaft 14, which is connected to reciprocate the needle of a sewing machine. The mechanism for driving the shaft and thus reciprocating the needle comprises a crank so connected with the shaft, and with a driving shaft, that it may be shifted into the axis of the driving shaft to stop the sewing shaft and lock it in position and may be shifted into position at one side or eccentric to the axis of the driving shaft when the sewing shaft is to be again started and driven. As shown the crank 16 is carried on the rear end of a short shaft 18, the forward end of which is connected by a universal joint 20 with the rear end of the shaft 14. The crank has a ball and socket connection with a block 22 which fits within a radially extending slot 24 formed in a disk 26 which is secured to the forward end of the continuously rotating driving shaft 28. The shaft 18, which forms a movable section of the sewing shaft, is mounted in a bearing sleeve 30 mounted for vertical movement to shift the crank 16 into and out of the axis of the driving shaft 28. The bearing sleeve is guided in lts movements and held rigidly against lateral movements by check pieces 32 rising on opposite sides of the sleeve and fitting between the opposed parallel surfaces of the bearing lugs 34. When the crank 16 is in the axis of the driving shaft, as indicated, the block 22 rotates idly about the crank and the sewing shaft remains locked in its stopped position. When the sewing shaft is to be started the bearing 30 is shifted as the slot 24 is approximately in its vertical position and the shaft section 18 brought into alinement with the driving shaft 28 and the shaft 14. The block 22 and crank 16 are thus brought into position eccentric or to one side of the axis of the driving shaft and form a crank connection between the driving and sewing shafts through which the sewing shaft is driven in unison with the driving shaft. The mechanism for thus shifting the bearing sleeve and crank comprises an arm 36 having its lower end pinned to a rock shaft 38, and its upper end connected by a link 40 with the bearing sleeve. The shaft and arm are rocked to start and stop the sewing shaft by cams 42 and 44 formed on a disk 46 and arranged to act alternately upon two arms 48 and 50, the hubs of which surround the shaft 38 on opposite sides of the arm 36 and are connected by a bar 52 which passes through the slotted lower end of the arm. The arms are thus connected to rock the shaft and arm 36 while being free to slide on the shaft to bring the cam rolls on the ends of the arms alternately into and out of the paths of the cams 42 and 44. The cam disk 46 is secured to a vertical shaft 54 which is continuously driven from the driving shaft 28 through gearing 56. The arms 48 and 50 are shifted into and out of the paths of the cams 42 and 44 by an arm 58 secured to a rock shaft 60 and provided at its upper end with shoes 62, engaging an annular groove 64 in the hub of the arm 50. The shaft 60 is rocked through a lever 66 secured to the shaft and provided with an arc-shaped surface extendplunger 68 carried in an arm 70, which is secured to a shaft 72. The arm is connected by a link 7 4 with an operating treadle and is normally held in the position indicated in Fig. 2 so that the plunger 68 presses against the upper end of the lever 66 and tends to hold the hub of the arm 50 against the stop boss 76. \Vhen the parts are in stopped position, as indicated, the lower end of the lever 66 is engaged by a latch 78, which is mounted to swing on the shaft 7 2 and is held in engagement with the lever by a spring 80.

WVhen the sewing shaft is to be started the arm 7 0 is swung downward by depression of the treadle so that the plunger 68 presses against the lever 66 below the shaft 60 and tends to shift the arms 48 and 50 toward the right in Fig. 2. As the arm 70 completes its downward movement a lug 82 on the arm strikes a lug 84 on the latch 78 and disengages the latch from the lever 66 so that the arms 48 and 50 are shifted toward the right by the spring plunger 68. This movement of the arms moves the roll on the end of the lever 48 out of the path of the cam 42 and brings the roll on the end of the arm 50 into the path of the cam 44 so that the cam 44 rocks the shaft 38 and arm 36 to straighten the toggle formed by this arm and the link 40 and thus raise the crank 16 into driving position. When the lever '66 and shaft 60 are thus rocked to start the sewing shaft they may be retained. in shifted position by retaining the treadle in depressed position in case the stopping of the sewing shaft is to be controlled by the operator. In the construction shown however the stopping of the shaft is automatically controlled by a timing mechanism operated from the sewing shaft and the lever 66 and shaft 60 are retained in shifted position by a latch 86, which engages a lug 88 on the lever. The latch is mounted to turn on the shaft 72 and is held in engagement with the lug by a spring 90 connected to an arm projecting downward from the hub of the hatch. The latch holds the parts in shifted position against the pressure of the spring plunger 68 after the arm 70 and the plunger return to normal position upon release of the treadle, and until the sewing shaft is again to be stopped, when the latch 86 is disengaged from the lug 88 thus permitting the arms 48 and 50 to be shifted by the spring indicated in Fig. 2. This movement of the arms carries the roll on the end of the arm 50 out of the path of the cam 44, and brings the roll on the arm 48 into the path of the cam 42, so that this cam acts on the arm 48 to rock the shaft 38 and arm 36 to break the toggle formed by this arm and the link 40 and draw the crank 16 down into the axis of the driving shaft 28. When the shaft 38 is rocked in either direction it is held in position by a friction disk 92, secured to the end of the shaft, and engaging a boss 94 on the side of the casing.

The mechanism for automatically controlling the disengagement of the latch 86 and the stopping of the shaft 14 comprises a cam disk 96 mounted on a shaft 98 and engaged by a finger 100 on the end of an arm 102 which is secured to a rock shaft 104. The rock shaft also carries an arm 106, which is connected by a link 108 with an arm 110 projecting from the hub of the latch 86. The disk is provided with a cam projection 112 which engages the finger 100 and rocks the shaft 104 to disengage the latch 86 and thus render active the mechanism which stops the sewing shaft.

The cam shaft is intermittently advanced by a spring pressed pawl 114, mounted in a pawl carrying lever 116, and arranged to engage the teeth of a ratchet wheel 118 formed on the face of the cam disk 96. A spring pressed stop pawl 120 is also arranged to engage the teeth of the ratchet wheel and prevent reverse movement of the cam shaft so long as the pawls are in active relation to the ratchet wheel. The pawl carrying lever is oscillated from an eccentric 122, on the shaft 124, through an eccentric rod 126, the lower end of which is connected to the lever. The shaft 124 is driven from the sewing shaft through spiral gears 128.

While it is preferred to utilize the specific construction shown and described in embodying the invention in an automatically controlled sewing machine it will be understood that this construction and arrangement is not essential to the broader features of the invention and may be varied or modified as found desirable or best suit ed to the construction and mode of operation of the machine to which the invention is to be applied.

What is claimed is:

1. A driving and stopping mechanism having, in combination, a driven shaft, a driving shaft having a fixed axis, a crank connected to transmit motion from the driving to the driven shaft, and means for moving the crank connection into and out of the axis of the driving shaft to stop the driven shaft in a definite position and to start the shaft.

2. A driving and stopping mechanism having, in combination, a driven shaft, a shaft section connected to the end of said shaft by a universal joint, a driving shaft, a crank connection between the end of the shaft section and the driving shaft, and means for moving the shaft section to shift the crank into and out of the axis of the driving shaft.

3. A driving and stopping mechanism or i having, in combination, a driven shaft, a shaft section connected to the end of said shaft by a universal joint, a driving shaft, a crank connection between the end of the shaft section and the driving shaft, and means for moving the shaft section in a fixed plane to shift the crank into and out of the axis of the driving shaft during the travel of the crank connection through the plane.

4. A driving and stopping mechanism having, in combination, a driven shaft, a shaft section connected to said shaft by a universal joint, a driving shaft, a hear: ing for the shaft section, guides for determining the path of movement of the bearing, a crank connection between the end of the shaft section and the driving shaft, and mechanism for moving the bearing alternately in opposite directions to shift the crank into and out of the axis of the driving shaft.

5. A driving and stopping mechanism having, in combination, a driven shaft, a shaft section connected to the end of the driven shaft by a universal joint, a crank on the end of the shaft section, a driving shaft having a radial guicleway embracing the crank, and means for moving the shaft section to shift the crank in the guideway into and out of the axis of the driving shaft. 1

6. A driving and stopping mechanism 7 having, in combination, a driven shaft, a

shaft section connected to the end of the driven shaft by a universal joint, a crank on the end of the shaft section, a driving shaft having a radial guideway embracing the crank, means for moving the shaft section in a fixed plane to shift the crank into and out of the axis of the driving shaft during the travel of the guideway through the plane.

7. A driving and stopping mechanism having, in combination, a driven shaft, a shaft section connected to the end of said shaft by a universal joint, a driving shaft, a crank connection between the end of the shaft section and the driving shaft, a cam operating in time with the driving shaft for shifting the shaft section alternately in opposite directions, and means for controlling the action of the cam.

8. A driving and stopping mechanism having, in combination, a driven shaft, a driving shaft, a transversely movable crank connection between the ends of the shafts arranged to form a driving connection when out of the axis of the driving shaft and to lock the driven shaft in a definite position when in the axis of the driving shaft, and means for moving the connection to shift the crank into and out of the axis of the driving shaft.

9. A driving and stopping mechanism having, in combination, a driven shaft, a driving shaft, a transversely movable crank connection between the ends of the shafts, a cam operating in time with the driving shaft for moving the connection to shift the crank into and out of the axis of the driving shaft, and means operating in time with the driven shaft for rendering the cam active to shift the crank into the axis of the driving shaft.

10. A driving and stopping mechanism having, in combination, a driven shaft, a driving shaft, a transversely movable crank connection between the ends of the shafts, means for moving the connection to shift the crank into and out of the axis of the driving shaft, controlling mechanism operating in time with the driven shaft for moving the crank into and out of the axis of the driving shaft, means under the control of the operator for rendering the controlling mechanism active to shift the crank out of the axis of the driving shaft, and mechanism operating in time with the driven shaft for rendering the controlling mechanism active to shift the crank into the axis of the driving shaft.

11. A driving and stopping mechanism having, in combination, a driven shaft having a fixed axis, a drivingshaft having a fixed axis, a radially movable driving connection between the shafts, and controlling mechanism operating in time with the driven shaft for moving the driving connection into and out of the axis of the driving shaft.

12. A driving and stopping mechanism having, in combination, a driven shaft having a fixed axis, a driving shaft having a fixed axis, a radially movable connection between the shafts arranged to form a driving connection when out of the axis of the driving shaft and to hold the driven shaft in a definite position when in the axis of the driving shaft, and means for moving the connection into and out of the axis of the driving shafts.

JOSEPH FOSSA. 

